body{margin:0;font-family:Arial,sans-serif;background-color:#f4f4f4}header{background-color:#222;color:#fff;padding:20px;text-align:center}main{padding:20px}section{background:#fff;margin-bottom:15px;padding:15px;border-radius:6px}footer{background-color:#222;color:#fff;text-align:center;padding:10px}